Quickly designed these diffusers for my PAR-16 lights.
If you print two you can sandwich a piece from a baking/parchment paper to do the diffusing.
You could also design your own fill for the circle and try it out.
Uploaded some of my fun ones, bet i ended ut with parchment paper in the end.
0.2mm_med_hull.stl | 146.3KB | |
0.2_mm_solid.stl | 23.7KB | |
par16_frame.stl | 17.5KB | |
Square_grid.stl | 205.6KB |